OK I answered my own question. Like this S1:=S1.http://files.engineering.com/getfile.aspx?folder=214d58ef-af7c-4ac7-b3fc-4c99ce81d7c4&file=ResetVariable.jpg
If a variable has been defined numerically. How can it be released for subsequent reuse symbolically?
Of coarse the variable can be reassigned, but how can it be deassigned?